The Islamic Revolution was one of the important changes in Iran for the creation and development of national identity against subcultural, contradictory and intra-ethnic identities and was able to facilitate the transition from ethnic identity to national identity by relying on social capital, the consequences of which were the promotion of social tolerance, reduction of ethnic political conflicts and the multilateral connection and bonding of ethnicities with the governance of the Islamic Revolution. Accordingly, the main purpose of the study is to study the national identity of Iranians from the perspective of social capital during the periods of 1384 to 1403. The research method is quantitative meta-analysis (CMA2); the unit of analysis is articles (Normegs, Mag Iran) and masters and doctoral theses (Iran Doc) in the period 2005 to 2024. 50 scientific documents were selected from the statistical population using a deliberate-non-probability method (article evaluation according to entry and exit criteria); 31 sample sizes were selected and the results were analyzed using Cohen's d and Fisher's f tests. The results show that social capital, as a macro-social indicator, has been able to influence the connection and belonging to the national identity after the Islamic Revolution, and the value of this effect coefficient is equal to 43 percent. Also, the dimensions of social capital, including social belonging (0.389); social cohesion (0.308); social participation (0.418); social support (0.355); social awareness (0.292), have been effective in promoting the national identity of Iranians after the Islamic Revolution of Iran, and this effect is significant.